Fireproof door construction



Dec. 23, 1952 1 o, FUGELSTAD 2,622,547

FIREPROOF' DOOR CONSTRUCTION Filed June 16, 1949 I N VE N TOR. johan Osea? Fudstacl ATTORNEY movement.

Patented Dec. 23, 1952 UNITED STATES PATENT OFFICE FIREPROOF DOOR CONSTRUCTION .Johan Oscar Fugelstad, Stockholm, Sweden Application June 16, 1949, Serial No. 99,407 In Sweden June T17., Vv1948 2 Claims.

l This invention relates to an improvement `in doors for safes `and other lire-proof rooms, in which the door as well as the surrounding frame consists of a case-like construction covered at the inside and the outside by metal plates and limited at the sides by transverse portions tightening against each other, said case-like construction being in the ordinary known manner lled with an appropriate insulating material.

In order to obtain a complete insulation between the inner and the outer metal-plate covering it is not only necessary to give the door and the walls a suicient thickness and to select an insulating material for the space between the covering plates having such properties, that said material, when heated, remains in its position and presents suiiicient heat resistance, but the doors and door-frames must also be constructed in such a manner, that the heat will not be led through metallic parts to the inside of the safe or room and that heated -air cannot pass through the joint between the door and the frame.

The object of the present invention is to construct the transverse border portions of the door and the door-frame so that the above conditions are fully satisfied.

An embodiment of the invention is shown in the accompanying drawings, in which Fig. l is ia transversal section through a door according to the invention in theclosed position and Fig. 2 shows vthe same door in the opened position.

In the Idrawing 2 is the door and I the door frame, the door being 'pivotally mounted on pivots 3 in the door frame. In the embodiment herein shown, the transverse portions joining the outer cover plates 4 and the Ainner cover plates 5 of the door and the door frame, and joining together in the closed position lof the door, are divided into three members, joined with yinter-- posed insulating sheets by screws or rivets, in such manner that the continuous heat conducting connection between the outer and the inner.

cover plates are interrupted at least at two places. The transverse portionsand the insulating sheets are further arranged so "that the borders of the asbestos sheets in the closed position of the door form tightening packings extending around the door. According to the relative movements between the door and the door frame when Aopening and closing the door, the insulating sheets are disposed with their planes in directions parallel vto the tangent to said'relative In other wordsthe sheets disposed along the hinge side of the door are parallel with the plane of the door and the sheets disposed `along the other three sides of the door -are disposed transversely to the plane of the door.

This is obtained in the following manner. The transverse portions of the hinge-side of the door and the door frame are formed of three gutter- Alike bars I and s, the outer flanges 6a and 8a of the outer bars 6 4and 8 being` connected with the corresponding cover plates 4 and 5 respectively. In the example illustrated the ange Ba is connected with the outer cover plate 4 by welding, preferably resistance welding, while the lflange 8a and the inner cover plate 5 are separated by an insulating sheet E9 and connected together by screws I0. The flanges of the bars 6, 'I and 8 "facing each other are Ialso separated from each other by interposed insulating sheets II and connected together by screws I2. The middle portions of the bars are inclined `in relation to their anges so as to form tooth-like extensions I3 engaging between each other and permitting adjacent edge portions of the insulating sheets on the door and the frame to tighten iagainst each other in the closed position of the door.

At the other three sides of the door the transverse portions joining the outer and inner cover plates 4 `and 5 with each other comprise two angle bars I4 and I5, one ilange of 'which is connected with the outer or inner cover plate, the

'other flanges of the two angle bars extending past each other, having an insulating sheet I6 interposed between them and being connected to- .gether by means of screws I'I. .portions of the corresponding sides of the door Yframe comprise also two angle bars I8 and I9 The transverse `connected with the inner and outer cover plates and :having their transverse iianges extending past 4each other, but .the distance between said ilanges is `larger than in the door and have interposed 'between them an intermediate Flatiron .bar 22 andinsulating sheets 20 and 2I on iboth .sides thereof. The free end of the iiange of Vbar |14 connected with the outer cover plate 4 of the door is bent inwardly .to form a lip 24 which in ftheiclosed position of the door engages a groove .formed between the outer edge of the insulating sheet 21|, the `transverse ange of the yangle .bar Ianda flat `ironrbar .25 formingpart'o'f the transverse `portion -of the door frame, lsaid flat `iron bar 2'51extending past the outer edge por- 1'55 12.8. The angle bar I9 connected with the inner cover plate 5 of the frame has its transverse flange extending past the edge of the insulating sheet 2) and forming therewith and with the at iron bar 22 a groove, which in the closed position of the door is engaged by the edge of a further at iron bar 21 fiXed on the outside of the insulating plate I6, fixed on the angle bar I5 of the door and extending past the edge of said insulating plate, said flat iron bar 21 being connected by screws 28 with the angle bar I5. Gaps are left between the ilat iron bar 21 fastened on the outside cf the insulating sheet I6 on the door and the transverse flange of the angle bar i4 and between the flat iron bars 22 and fixed on the inside of the insulating sheet 2l on the frame. These gaps, which face each other in the closed position of the door and form a continuous air channel 2Q (see Fig. 1) running along the three sides of the door and the door frame. In the closed position of the door the edges of the parts 24 and 21 engaging the grooves in the transverse portion of the frame are pressed against the outward edges of the insulating sheets 2l and 2U, the free edges of the parts i9 and 25 engaging the grooves formed between the parts I5 and 21 and the parts i4 and 2li. Thereby a combined and multiple labyrinthand packing tightening is obtained around the whole door between the door and the frame.

As can be seen in Fig. 1 in the closed position of the door the outer and inner cover plates 4 and 5 are in heat conducting connection with each other only through a little number of screws having a relatively little heat conducting cross area which permit only practically unimportant quantities of heat to pass by conduction from the outside to the inside of the door `and door frame through their transverse portions.

Any other fastening means than screws, for example rivets, may be used for the connection between the dilierent parts and the number of elements and interposed insulating sheets in the transverse portions of the door and the door frame may be used within the scope of the appended claims.

What I claim is:

1. In a door and door frame construction for safes and other fire-proof enclosures having inner 'and outer cover plates of metal, transverse border portions joining said cover plates together and forming door jambs and border portions for a door fitting into said jarnbs, said transverse portions comprising spaced heat conducting sections between the inner and outer cover plates and insulating sheets interposed between said heat conducting sections of said transverse portions, said insulating sheets being fastened between said sections of the transverse portions in positions parallel with the direction of relative motion between the door and the door frame, namely essentially parallel to the cover plates of the door at the hinge side of the door and the door frame and essentially perpendicular to the said cover plates at the opposite side of the door :and the door frame, said heat conducting sections of said transverse portions being so proled and joined together with the insulating sheets, that one edge surface of each of said insulating sheets in at least one of two adjacent transverse portions of the door and the door jamb forms the bottom of a deep groove in which a. corresponding projection on the other of said two transverse portions is adapted to engage and to be pressed against said edge surfaces of the insulating 4 sheets when the door is closed, the insulating sheets of the transverse portions at the hinge side of the door and the door jamb being fastened between plane side anges of bent metal sheet sections of general U-shaped section, said side flanges being parallel with said insulating sheets and extending inwardly from the transverse portion of the door and the door jamb, the intermediate portions of said bent sections being inclined to said side flanges and adapted to engage grooves formed between two bent sections of the transverse portion that faces the transverse portion of which they form a part.

2. In a door and door frame construction for safes and other fire-proof enclosures having inner and outer cover plates of metal, transverse border portions joining said cover plates together and forming door jarnbs and border portions for a door fitting into said jambs, said transverse border portions comprising spaced heat conducting sections between the inner and outer cover plates and insulating sheets interposed between said heat conducting sections of said transverse portions, said insulating sheets being fastened between said sections of the transverse portions in positions parallel with the direction of relative motion between the door and the door frame, namely essentially parallel to the cover plates of the door at the hinge side of the door and the door frame and essentially perpendicular to the said cover plates at the other sides of the door and the door frame, said heat conducting sections of said transverse portions being so profiled and joined together with the insulating sheets that one edge surface of each of said insulating sheets in at least one of two adjacent transverse portions of the door and the door jamb forms the bottom of a deep groove in which a corresponding projection on the other of said two transverse portions is adapted to engage and to be pressed against'l said edge surfaces of the insulating sheets when the door is closed, the insulating sheets of the transverse portions at the hinge side of the door and the door frame being fastened between plane side flanges of bent meal sheet sections of general U-forrned section, said side flanges being parallel with said insulating sheets and extending inwardly from the transverse portion of the door and the door jamb, the intermediate portions of said bent sections being inclined to said side flanges and adapted to engage grooves formed between two bent sections of the transverse portion that faces the transverse portion of which they form a part, the insulating sheets of 4the transverse portion forming the hinge side of the door having one side edge lat the bottom of said grooves, and the insulating sheets of the transverse portion forming the jamb on the hinge side of the door frame extending outwardly to the pointed angle edge between a side fiange and the intermediate portion of the adjacent bent metal section.

JOHAN OSCAR FUGELSTAD.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 1,299,607 Pollock et al. Apr. 8, 1919 1,404,044 Millice Jan. 17, 1922 1,547,721 Bellamore July 28, 1925 1,623,155 Bellamore Apr. 5, 1927 

